Semi-automatic gun.



W. H. BRIGGS, DECD.

M. E. BRIGGS, ADmNIsTRATBIX.

SEMI-AUTOMATIC GUN. APPLICATION FILED NOV. 13, 1907. RENEWED MAR. 26, 1913.

Patented Oct. 28, 1913.

7 SHEETBSEEET 1.

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C] How/11215 ii! Hi ll l W. H. BRIGGS, DBGD. v M. 1:. BRIGGS, ADMINISTRATBIX.

SEMI-AUTOMATIC GUN. APPLICATION FILED NOV. 13, 1907. RENEWED MAR. 26,1913.

Patented Oct.28,1913.

7 SHEETS-SHEET 2.

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SEMI-AUTOMATIC GUN. APPLIGATIOH IILBD NOV. 13, 1907. RENEWED MAR. 26, 1913. 1 U 76,875,

W. H. BRIGGS, DECD. M E mamas, ADMINISTEATRIX 1913. 7 SHEETS-MEET s.

Eatented 0st. 28

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M E BRIGGS ADHINISTEATRIX SEMI-AUTOMATIC GUN. APPLICATION FILED 110113, 1907, RENEWED MAR. 26, 1913.

Patented Oct. 28

SHOT/$133 7 SHEETS-SHEET 4.

W. H. BRIGGS, DEGD. M. E. BRIGGS, ADMINISTRATRIX.

Y SEMI-AUTOMATIC GUN. v

APPLIOATIONIILBD NOV. 13, 1907. RENEWED MAE. 26,1913. mm m Patented 001;. 28, 1913.

7 SHEETS-SHEET 5.

' W. H. BRIGGS, DEGD.

H. E. BRIGGS, ADHINISTRATRIX. SEMI-AUTOMATIC GUN. APPLIOATION FILELP NOV. 13, 1907. RENEWED MAR. 26 15113. w'yfi wfi, malted W. 28, 1913.

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I (W, A; E vwemtoz My) a I 4 m- .W. H. BRIGGS, 115cm M. E BRIGGS, ADHINI3TRATEIX. SEMI-AUTOMATIC GUN. APPLIUATION FILED NOV. 13, 1907. RENEWED MAR. 26, 1913. lfiT/fifi Yfi, Patented 001;. 28, 1913.

7 SKBETS-BHEET 7.

Fyglf $3 @Homimp 1 {P71 1" i Fellini it NIL-LEAH H. DPTGGS, OF WA E-IINGTON, DIS'ELYECIT F GGLUTJTBE'A HABY EDDY DEIGGS ADMINISTRATRIX OF SAID NELLEABE HALE DR XQGS,

SEliII-AUTOTMATIC' GUN.

f b' (ZZZ om may concern lie it known that I, lViLLIAu H. Demos. u citizen of the United States, esiding zit l i' nshington, in the District of Columbia, have invented certain new' and useful linroieincnts in Ficmi-Automntic Guns; and do hereby declare the following to be a ill. cl mi, and exact description of the invention, such as will enable others skilled in the to which it appertains to make and use the some.

pre ent invention relates to the improvements in semi-automatic guns, in which 9. reciprocating breech block is used. and is more especially intended for guns of such 21 caliber as to render the oidiiiiry ..c Yention. however. apply equally Well to breech blocks hevmge Vertical motion, as

well to breech blocks having a horizontal motion, and unless particularly specified in claims, l intend the intention to apply to any of the Well known types of guns now in use, to which said invention may be applicable.

invention will be understood by reference to the accompanying drawings, in which the shine parts are indicated by the sense le and numerals throughout the seierul "lPfiCH.

i itz'ui'c 1 shows a plain View of the breech end of the gum. showing; my invention up- ;iliedthere o. parts beingbrokenmvay, and heiu shown in section. Fig. 2 a emiirr-n oi? the device shown in Fig. seen from. the right of said figure. 3 shows a horizontal central section mugh the breech of the gun, on. a larger scale the r. is shown in the previous figures, ho breech block beingshown in plan and l cnrtride-e case being shown in the embez. Fig. l is u detail showing tor. u see from the rear. 7 rcur elcietion of the breech of the parts of the mount being omitted. Fig. e detu'l showing the engagement of the l' ope ating the gun semi-automati- I 11 section along: the lines 7 '1' ct looking in the directionot the .13.. 5 shows diugiuniniuticull the oi tlucuin arrangement when the (loved and the mechanism locked.

all

h is

Specification of Letters Patent.

is 2: simi ar View to Fig. 8. but shows,

Patented C ot. 28,

Renewed March 26, 913. Serial H0. 2 57,6423.

the cam arrangement when the recoil is not quite complete. Fig. 10 shows the cam 31'- rangeinent on counter recoil with the breech open and the counter recoil not quite complete. Fig. 11 shows the cam arrangement with the cam released just before locking.

12 shows the cum locked out of engagement, the parts being then in position for operating the breech block by hand. ,Fig. 13 is a plain View, partly in section, or the hund lever, aiid illustrates the means of attaching some to the rock shaft and to the gun. Fig. let shows a. section along the line 14 1% of Fig. 13, and looking in the direction of the arrows. Fig. 1 5 shows a section idongz the line 15 15 of Fig. 13 and looking n the direction ofthe arrows. Fig. 16 is :1

lever to the gun. Fig. 17 shows a horizontal section through the breech block and illustrates the operation of the firing incohunism. Fig. 18 shows a vertical section through the Walls of the un, and through the breech-block, and illustrates the means for connecting the electric conductors to the firing mechanism. Fi 19 shows a section through the tclgger box. parts being "shown in elevation.

A represents the gun body having the usual reinforcing band A.- over the powder chamber.' This band is provided with the usual lugs A for the piston rods of the recoil cylinders, end With lugs A? for the nmiu bolt or rock shaft for moving the breech block, and with the lug A*, see Fig. 5, to receive'the operating arm on the rock shaft.

projects rearward, as shewn at B, and is proi ided'wighn housing for the com on rengement, es will be hereinafter described. The cradlecsrries one or more recoil cylinders to, of thousueltype, having: piston rods D sccered to the lugs A in the usual way. E represents the breech block. which is provided with an t. shaped slot, E, adapted to receive thearrri F and lug f" projecting therefrom, as shown in Figs. 1 and This arm is rigidly attached to, or preferably integral with, the rock shaft F, which is ourncled in the lugs A at the side of the gun body. By having the arm F fiat on top Where it engages in the upper wall of-tl e Slot E in the breech block, it affords alarge ggh breech block in the process of moving detail showing; the pin for lockingthe hand- A part, of the cradle, is Shown, which iearing surface to take part of-the Weight the same into and out of its chamber, while the small lug f which effects the cainming operation, presents small friction surfaces, thus facilitating the operation of the device.

The rock shaft maybe rocked in by hand, or by the semi-automatic attachment,

as will be hereinafter described.

The hand operating devices comprise a lever H (see Figs. 1, 2, l3 and 14) which is loosely mounted over the upper end of the rock shaft F, which end is provided with an 1 One annular groove F, as shown in Fig. 14.

side of this groove, a notch f is provided,

into which the feather in of the feather piece K is caused to engage, and the handle H is sprung up to the position indicated in dotted lines in Fig. 14. The rear end of this feather piece is provided with a cam groove 7; engaging the pin k on the handle H.

When. the handle is thrown down to the neath the shoulders m of the block M fast 3 to the gun shown in Fig. 13; thus forming a bayonet joint. This block is provided with an elongated slot m", as shown in Fig. 15, and the pin N is provided with a flange n in dotted lines in Fig. 3.

engaging one side of the hand lever and is locked at that side with the nut 11, engaging the sore threads a", see Figs. 13 and 16. The pin is provided with a feather 02 which engages a corresponding groove in the handle H, see 1 1- so that when the handle H is thrown up to the position indicated in dotted lines in Figs-2 and 14, the head'n of the pin X will clear the slot n", so that when the feather piece is moved to the engaging position, the hand lever may be swung away from the gun body, and thus the breech mechanism may be operated by hand.

The semi-automatic gear comprises the j short arm 1? pro ecting frointhe rock shaft F, to which is connected the chain 0 fast to the rod P, which passes through elongated ,eve

of the spring will always be sufiicient to return the breech block to the closed position, when it is released by tripping the extractor, as will be hereinafter described.

Before describing the semi-automatic cam arrangement, it will make the operation clearer if we first describe the operation of the extractors.

One of the extractors is shown in plan in Fig. 3 and in rear elevation in Fig. i; the other is siinilar,- but having the parts reversely disposed. 7

The breech block E shown in plan in Fig. 3, is puovided with a straight groove 0 in its upper face, which is joined by the curved groove 8', to the straight groove 0 beyond andin -rear of this groove 6 is a shoulder a" on the breech block. The breech block also has a straight groove e on its upper face.

The extractor R consists of a flat plate of metal, having an inwardly projecting claw or rib R, to engage the rim of the cartridge case. It has also, on its heel, an inwardly projecting cylindrical lug 1' adapted to enin the grooves e, e, and e of the breech block; and also a similar cylindrical" lug '1" opposite the claw, to engage in a straight groove a" in the inner wall of the breech block chamber of the gun, indicated Opposite the lug r is a similar big 1*, cut away as at 'r, to provide a flat engaging face. This lug 7", projects into the groove 0 when the breech is closed, and passes freely up the groove 0 when the breech block is moved for opening or closing; but the face r engages the shouldcr 6 when the breech is open, and holds the breech block in the open position until the extractor is tripped.

The front face of the extractor plate is curved as at r to roll along the front face of the breech block chamber, while the rear face 1 of the extractor plate is preferably flat to slide along the straight edge of the rib a on the breech block when the extractor is swung to its rearward position.

The operation of the extractor is as fol: lowsi -Suppose the breech to be closed, and the empty cartridge case R to be in the gun. the aarts bein in the osition shown in l a Fig. and the breech block to be moved for opening the breech.

rod P is a collar P hold in place by washer and lock nuts. The spring P is held under compression between this collar P and the other end of the cylindrical casing and the screwing up on these loch nuts. 7

The casing i carrying thespri1ig-P rod P and chain 0, may be moved'from the gun by a single operation, and for this purpose, the casing is preferably detachably connected to the gun body in any convenient way, as by a dovetailed groove and tongue arrangement. As the gun i'ecoiis, the tension The breech block will have quite a little lateral movement, and

I will hav'e'acquired considerable momentum before the cam groove (3 will engage the lug 11*, the said lug having meantime passed tension on the spring may be adjusted by freely along the straight groove 6, a powerful camming action is secured, not only due to the inertia of the breech block, supplemented by the power directly' applied to opening the same, but also due to the powerful leverage on the extractor, which starts with a slow motion to the claw, effected at a long" leverage, which motion is rapidly accelerated as the leverage shortens, due to 1 all? the rolling of the extractor along its front face. The result is a slow crying out m0- tion at the start, and a rapid ejecting motion at the end or" the movement of the extractor. The straight groove a" in the gun engaging: the log 7" on the ext actor, causes the claw to more backward in a straight line, thus holding it in close engagement with the rim of the cartridge case until the latter is ejected. As the extractor rolls about its front the lug 7' is moved imckwurd until it passes above the shoulder 0 on the breech block. and clear of the same. The breech niechanisni'is preferably so adjusted-that there is a slight overthrow of the operating arm F, causing the breech l)l0Cl to move slightly toward the closing position the end of the travel of said arm, for reasons yell known in the art. Theresnlt of this motion or" the breech hlocl: tucause its houlder e to engage the face v v of the. extractor, thus locking the breech block against further closure, as indlcated in dotted lines in Fig. i. It? now the extractor be tripped, as by the insertion of it tresh'cartridge case, or by hand, the breech bloc; can be closed either by the semi-automatic gear, or by hand.

The mechanism for controlling the action of the semi-automatic gear. and for throwng it into and out of operation will'now he described. 0n the opposite end of the shaft: il from the hand lever H, there are two arms, F and F, the former of which is preferably crerided with an anti-friction roller l. The locking arm F is provided with a curved shoulder f shown in dotted lines in Figs. 8 to 12.

Q represents the cam block, which is pro vided with a cylindrical stem Q revolublj/ mounted in the socket B of the boss B carried by the cradle, and normally held againstrotation in one direction by the coil spring Q", see Fig. (3. The cam block is held in place in the housing by the cap Q which is mounted on the boss B and engages the cam block after the manner of a bayonet joint. as shown in Figs. 6 and 7." Thus, the cap is locked to the cam block, and the latter is locked against being removed from the housing, but at the same time, is free to rock through an angle in one direct ion.

The cam block Q and the cap Q may be held in either oi two positions by means of the spring latch g. which projects into one of tw recesses, 71*. 72*, in the hollow boss B as shown in Fig. T. The cap Q is provided with a knurled or roughened rim, as shown in Fig. 5. and the spring catch 4 provided with a hand lug 1'. see Fig. 7, for convenience of n'i'aniulatiou. The inner end of the cam block Qis provided with a cam Q having the cam faces g, 9*, and the face f of the locking arm shoulder .7 On the opposite side (am block from the cani (Ifin thel 'citiug loo (3* hating a curred lOLil-fiilf face The engagement the roller F" with the cam Q rocks the shaft F on counter recoil: and the coaction of the coin block and of said roller with the locking arrangement will be understood in ret'erence to Figs. l)

l'n Figs. 8 to 11, the series of steps during the complete cycle is illustrated, such parts as are not necessary to illustrate this reaction being omitted for the sake of clearuoss in the drawings. Fig 8 shows the rock shaft if, and the cam Q, in the normal position; that is, with the bree h closed, and with the mechanism locked. in this posi-, tion, the cam block is swung by the Q", see ig. 6, so that the shoulder brings up against shoulder e on the part ll can ried by the cradle. In this position, the cam block cannot be rotated in a direction opposite to that indicated by the arrow. in this position of the cam bio l the holding engages the face 9 of the locking lug Q3, and the rock shaft is held against turning for opening the. breech. Now, if the gun 'recoils in the direction of the arrow, the roller F will strilte' the cam face q of the am t2." and will press said cam hack. rocking the cam block to the position shown in Fi 9. d ttter the roller passes clear of the cam face (1", the spring Q will snap the am back to the initial position shown in l 8 and 10. and as the gun goes forward on counter recoil, the roller 3* will strike the cam face If, rocliiiig the shaft F as indicated in Fig. 30, and opening the breech. After the breech is opened, the breech block: will be held in the open position by the extractor, as hereinbefore described, the cam 'ltlfll: the position shown in lig. it): but when the extractor is tripped, releasing the breech block, the latter will swing: up under the action of the spring P which will cause t ill locking arm F to rock the holding lust up until the curved holding face 7' posses under the curved face (1", just at the sitioii.sliowii in rig. ll assnmeo, at 'vhi' 1 time the spiral spring; Q will snap the cam hack to the initial position shown in 1 lo. 8. Thus. it will be seen it the can fvlih" on recoil, and operates no locking attachment ter-recoil, and that t is cleared during the first part of the recoil,

Q until the spring latch q engages in the notch 1). Thus, there are two positions for the cam block; one in which the "am is set for semi-automatic firing, and the other in which the cam block is set for hand operation of the gun only.

The gun is provided With suitable firing mechanism, preferably adapted for use either for mechanical or electric firing.

The preferred form of firing mechanism is that shown in detail, Figs. 17 and 18, and in plan in Fig. 1, and will now be described:

Referring more especially to Figs. 17 and 18, S represents the sear in the form of a bell crank lever, horizontally disposed in the breech block, which sear is pivoted at s", has its head s provided with a plurality of ribs to engage the. firing pin. and has a cocking arm S rounded at s and curved at s to engage the cocking toe, as Will be hereinafter described.

Trepresents' the firing pin, which is mounted in insulating material, inclosed in the cylinder T, whose head is provided with an-annular groove t". This cylinder T is mounted in another hollow cylinder T having annular ribs 25 to engage the head 5 of the sear S. This fiylinder T is mounted to slide on the cylinder T, and abuts against the shoulder t on the head of the said cylinder T. Cylinder T is provided with an annular rib t adapted to engage the ring Tflwhich ring is normally pressed by means of the spring T against the shoulder e in the breech block. The other end of the said spring abuts against a bushing E, which is slotted at one side to admit the passage of the head of the sear, as shown in Fig. 17. The point t of the firing pin passes through the usual opening in the breech block.

U represents a spring whose end a engages in the annular groove't of the cylinder T; and the other end of this spring '11? bears against a face on the breech block.

This spring is dove-tailed as at u to the block U", which is pivoted at 1& to the breech block, and has an arm 11- engaging face f on the head of the operating arm F. This spring normally holds'the point of the firing pin masked within the breech block, but the last part of the motion of the operating arm in closing the breech causes the shoulder f on said arm to press on the arm U, causing the point vi of the spring to gently press the head of the firingpin through the opening in the face of the breech block and against the primer, when the gun may be fired by electricity, a will be hereinafter described.

For mechanical firing, I prcvide a cocking toe V on the shaft V, which toe has a rounded face 1" adapted to engage the rounded face a of the cocking arm P. This shaft is normally held in the position sh wn in F g. 17 by a coil spring V", and the cocking toe yields as the breech block is moved to the opening position, but cocks the sear as the breechblock is moved to close the breech. The shaft V carries an arm V which engages with the bell crank. lever VJ, see Fig. 17, against which presses the rod X. This rod is telescopically connected with the rod X by means of the junction sleeve 1, see Fig. 2, which bears against the trigger spring :1;, and the tension of the spring may be adjusted by means of -t'-his sleeve. The tendency )f the return spring is to keep the two rods X and IX, with the arm X on the, shaft X carrying the trigger X normally in the initial position shown in 2 Fig. 19. This shaft X also carries an arm X having an insulated conducting head in, whichengages with the spring contact Y, connected to the return conductor Y connected to the gun body. A. spring contact piece Y is provided near the trigger mechanism, which is connected with the conductor Y which leads to the conductors Y Y and Y connected to the firing pin. :50 that the gun may be fired from either side, I arrange a. transverse rod X and lever X connected to a trigger mechanism X on the other side of the gun, so that the shaft X may be rocked from either side of the gun by pulling on one of the triggers.

It will be noted from an inspection of 19, that the first movement of the trigger X* will be to cause the spring contact Y to connect with the contact Y which will provide for electric firing, if the electric c irrent is on: the further movement of the trigger will cause the rod X to first coinpress the spring a and then to move the red X, rocking the bell crank lever 'W, and causing the arm V to trip the cocking toe r and release the sear. Releasing the sear will allow the spring T" to drivc'thering T and with it the cylinder T forward until. the said ring T" brings up against the shoulder 0. when the further forward movement of the ring will be arrested; but the inertia of the cylinder T will cause it to fly forward, striking the. shoulder I" and giving a blow to the tiring pin which is already incontact with the primer.

The spring U will return the tiring pin to the masked position, when the breech is opened.

it will be obvious that various modificatiens might be made in the hereindescribed ppm'atus, which could be used without dcpm from the spirit of my invention.

llaving thus described the invention, what l ('ltlllll and desire to secure by Letters Patcm of the United States is:

1. In a semi-automatic gun, the combination with a horizontal sliding breech block, of vertical main bolt pivotally mounted at one side of thegun body, an oii'e'rating arm carried by said bolt and engaging in a recess in the breech block, 'a hand lever mounted at the upper end at the said main bolt, means for locking said hand lever to said bolt, and releasing it therefrom when desired, an arm carried by the lower end of said inaiii belt, a. cam arran 'ement carried bythe cradle and adapted to engage said arm on coun er recoil, means for locking seid cam arrangement out of engagement with said arm when desired, and means for exerting spring pressure on said main bolt, tending to normally rock the same to the position closing the breech, substantially as described.

bolt, an arm on said main bolt, a cam arangenient carried by the cradle and adapt ed to en a c said arm on counter recoil and means for exerting spring pressure on said main bolt, tending to normally rock the same to the position for closing the gun, substantially as described.

3. in a semi-automatic gun, the combination with a sliding breech block, of a main bolt pivotally. mounted on the gun body, an operating arm. carried by said bolt and engaging the breech block, a hand lever carrying a pivoted handle and loosely mounted on said main bolt, means for locking said handle to the gun body, and operated by lifting said pivoted handle to release the blind lever from the. gun body, means for simultaneously locking the. lever to the main bolt, an arm on saidmain bolt, a cam arrangement carried by the cradle and adapted lo engage said arm on counter recoil, means for locking' said cam arrangement out by engagement with said arm when desired, and means for exerting Spring pressure on said main bolt, tending to normally rock the same to the position for closing the gun sub- I sianlially as described.

-l-. In a seminutomatic gun, the combination with a sliding breech block, of a main bolt pivotally mounted on the gun body,'an operating arm carried by said bolt and engaging in a recess in the breech; block, a hand lover loosely mounted on said main bull. a handlepivoted on said hand lever, means for locking said hand lever to the gun body, and operated by swinging said handle about i s pivot for releasin the hand lever from the gun body, and in ependent means also operated by swinging "said handle about its pivot for locking the b d lever to the main bolt, substantially as described.

5. In a semi-automatic gun, the combination with a sliding breech bloc of a main bolt pivotally mounted on the body, operating arni carried by gaging iii a recess in the breech lever loosely mounted on said 1 handle pivoted on said hand lever, means for locking said hand lever to the gun body, and operated by swinging said handle about its pivot for releasing the hand lever from the gun body, and independent means also operated by swinging said handle about its ivot for locking the hand lever the main olt, a cam arrangement carried b the. cradle and adapted to engage said arm on counter recoil, and means for exerting spring pressure on said main bolt, tending to normally rock thesame to the position for closing the gun, substantially as described.

(3. iii a semi-automatic gun, the combination with a. sliding breech block, of a. main bolt pivotally mounted on the gun body, an operating arm carried said bolt and engaging in a recess in the breech block, a hand lever loosely mounted on said bolt, a handle pivoted on said hand lever, means for locking said hand lever to the gun body, and operated by swinging said handle about its pivot for releasing the hand lever from the gun body, and independent means also operated by swinging said handle about its pivot for locking the hand lever to the main. bolt, a cam arrangement carried by the cradle and adapted to engage said arm on counter recoil, means for locking said cam arrangement out of engagement with said arm when desired, and means for exerting spring pressure on said main bolt, tending to normally rock the same to the a position for closing the gun, substantially as described.

7. In a semi-automatic gun, the c-timbinalion with a horizontal sliding breech block, of a vertical main bolt pivotally mounted at one side of the gun body, an operatino' arm carried by said bolt and engaging in a recess 'in the breech block, a hand levcrinounted at the upper end of the said main bolt, means for locking said hand lever to said main bolt, and releasing ittherefroni. when desired, an arm carried by the lower end of said main bolt, a cam arrangement carried by the cradle and adapted to engage said arm on counter recoil, rolling extractors mounted between the breech block and the Walls of the breech block chamber and aoapted to hold the breech block clear otthe bore the osition for closin the breech substantially as described.

In a semiautomatic gun t-he combinalion with a sliding breech block, of a main bolt pivotally mounted on the gun body,-

arm carried by said bolt and engaging in a recess in the breech block, rolling extractors mounted between the breech block and the walls of the breech block chamber and adapted to hold the breech block clear of the bore and to release same when tripped, a hand lever loosely mounted on said main bolt, a handle pivoted on said hand lever, means for locking said hand lever to the gun body, and operated by vinging said handle about its pivot for releasing the hand lever from the gun body, and independent means also operated by swinging said handle about its pivot tor locking the hand lever to the main bolt, sub stantially as described. 4

9. In a gun provided with a sliding breech block, the combination with the gun body provided with a breech block chamber with a. substantially longitudinal groove in the wall of said chamber, of a breech block provided with a holding shoulder and a cam groove for the extractor, an extractor mounted between the breech block and said wall of said chamber, and having acurved front face adapted to roll along the front wall of said chamber, and provided with a claw, and with oppositely disposed lugs, one lug projecting into the cam groove in the breech an operating block, and the other lug projecting into said groove in the gun body, whereby the claw of the extractor is caused to move in astraight line rearward with a slow prying out motion and with an accelerated ejecting motion, the said extractor being also pro-- vided with a third lug adaptcd'to swing over and engage said holding shoulder on the breech block, and to release same when tripped, substantially as described.

10. In a gun provided with a sliding I breech block, the combination with the gun body provided with a breech block chamber with asubstantially"longitudinal groove in the w: ll of said chamber, of breech block provided with a holding shoulder and a cam groove for the extractor, an extractor mounted between the breech block and said wall wt said chamber, and having a curved front face adapted to roll along the front wall of said chamber, and provided with a claw, and with oppositely disposed lugs, one lug projectin g; into the cam groove in the breech block, and the other lug projecting into said groove in the gun body, whereby the claw of the extractor is caused to move in a straight line rearward with a. slow prying out motion and with an accelerated ejecting motion. the said extractor being also provided with a third lug flattened at one side,

and adapted to swing over and engage said holding shoulder on the breech block, and to release same when tripped, substantially as described.

11. in a gun provided with a sliding breech block, the combination with the gun body provided with a breech block chamber with oppositely disposed and substantially hgngitudinal grooves in the walls of said chamber, oi a breech block provided with oppositely disposed holding shoulders and cam grooves for the extractors, extractors mounted between the breech block and said walls of said chamber, and each having a curved front :t'ace adapted to roll along the front wall of said chamber, and also being provided with a claw, and with oppositely disposed lugs, one lug projecting into the cam groove in the breech block, and the other lug projecting into said groove in the gun body, whereby the claw of the extractor is caused to move in a straight line rear ward with a slow and prying out motion and with an accelerated ejecting motion, each of the said extractors being also provided with athird luo' adapted to swing over and engage said holding shoulder on the breech block, and to release same when tripped, substantially as described.

12. In a gun provided with a sliding breech block, the combination with the gun body provided with a breech block chamber with oppositely disposed and substantially longitudinal grooves in the walls of said chamber, ot a breech block provided with oppositely disposed holding shoulders and cam grooves tor the extractors, extractors mounted between the breech block and said walls of said chamber, and each having a front face adapted to roll along the trout wall of said chamber. and also being provided with a claw, and with oppositely dis posed lugs, one lug projecting into the cam groove in the breech block. and the other projecting into said groove in the gun body.

*hereby the claw of the extractor is caused to move in a straight line rearward with a slow prying out motion and with an. accel eratedejecting motion. each of the said extractors being also provided with a third lug flattened at one side. and adapted to swing over and engage said holding shoulder on the breech block. and to release same when tripped, substantially as described.

In testimony whereof, I affix my signature, in presence of two witnesses.

lVILLli-Uvl ll. DRIGGS.

\Vitnesses R. M. PARKER, F. lNILKlN-SON.

Copies of this patent maybe obtained for five cents each, by addressing the Commissioner of Patents Washington, .6. 

